My apologies if this has been posted before, but I ran into a page with the 100 Things About Your Your PC Background. It's essentially a streamlined version of those surveys that people used to always forward around to their friends via email and encourage results to be sent back. As they note on the page, you really don't need to get an answer to everything, but it is interesting to read through the list of questions for your character and see if any of them spark an interesting answer in your head.

Brings back memories of writing pages of backstory for my 1st level characters in D&D when I was a kid, only to have them get killed off in the first few rounds of combat...